The government of a small but important country has decided that the alphabet needs to be streamlined and reordered. Uppercase letters will be eliminated. They will issue a royal decree in the form of a String of B and A characters. The first character in the decree specifies whether a must come ( B )Before b in the new alphabet or ( A )After b . The second character determines the relative placement of b and c , etc. So, for example, "BAA" means that a must come Before b , b must come After c , and c must come After d . Any letters beyond these requirements are to be excluded, so if the decree specifies k comparisons then the new alphabet will contain the first k+1 lowercase letters of the current alphabet. Create a class Alphabet that contains the method choices that takes the decree as input and returns the number of possible new alphabets that conform to the decree. If more than 1,000,000,000 are possible, return -1. Definition
标签： government streamline important alphabet
上传时间： 2015-06-09
上传用户：weixiao99
一篇中科院学位论文，《复杂背景下实时目标的跟踪与算法研究》，论文附有VC算法！
标签： 论文
上传时间： 2013-12-01
上传用户：极客
上下文无关文法（Context-Free Grammar, CFG）是一个4元组G=(V, T, S, P)，其中，V和T是不相交的有限集，S∈V，P是一组有限的产生式规则集，形如A→α，其中A∈V，且α∈(V∪T)*。V的元素称为非终结符，T的元素称为终结符，S是一个特殊的非终结符，称为文法开始符。 设G=(V, T, S, P)是一个CFG，则G产生的语言是所有可由G产生的字符串组成的集合，即L(G)={x∈T* | Sx}。一个语言L是上下文无关语言（Context-Free Language, CFL），当且仅当存在一个CFG G，使得L=L(G)。 *⇒ 例如，设文法G：S→AB A→aA|a B→bB|b 则L(G)={a^nb^m | n,m>=1} 其中非终结符都是大写字母，开始符都是S，终结符都是小写字母。
标签： Context-Free Grammar CFG
上传时间： 2013-12-10
上传用户：gaojiao1999
学生作业提交，跟踪学业系统。 利用UML建模，一套完整的UML设计图，使用RATIONAL ROSE绘制，已发布成网页格式，可以脱离原设计软件直接查看
标签：
上传时间： 2015-10-17
上传用户：13517191407
自己写的卡尔曼滤波源程序，仿真对匀加速转弯目标的跟踪
上传时间： 2015-12-05
上传用户：zhangjinzj
采用多模方式的卡尔曼滤波程序，仿真对运动目标的跟踪
上传时间： 2015-12-05
上传用户：z1191176801
We have a group of N items (represented by integers from 1 to N), and we know that there is some total order defined for these items. You may assume that no two elements will be equal (for all a, b: a<b or b<a). However, it is expensive to compare two items. Your task is to make a number of comparisons, and then output the sorted order. The cost of determining if a < b is given by the bth integer of element a of costs (space delimited), which is the same as the ath integer of element b. Naturally, you will be judged on the total cost of the comparisons you make before outputting the sorted order. If your order is incorrect, you will receive a 0. Otherwise, your score will be opt/cost, where opt is the best cost anyone has achieved and cost is the total cost of the comparisons you make (so your score for a test case will be between 0 and 1). Your score for the problem will simply be the sum of your scores for the individual test cases.
标签： represented integers group items
上传时间： 2016-01-17
上传用户：jeffery
kalman滤波实验，目标轨迹跟踪，很好用的例子，供大家学习用
上传时间： 2013-12-21
上传用户：semi1981
基于粒子滤波原理，选取纹理特征对目标进行描述，实现视频目标的跟踪。
标签： 粒子滤波
上传时间： 2016-08-31
上传用户：lacsx
这是写windows驱动时必需的一个工具，很难得的，IrpTrace-1.0007的全破解版，可以跟踪windows系统的irp命令
上传时间： 2014-01-22
上传用户：xsnjzljj
